Screen baseball system, hole opening and closing apparatus and ball pitching apparatus utilized thereby, and method for controlling pitching of screen baseball system

1. A screen baseball system comprising: a screen arranged in front of a batter's box and having a pitching hole allowing a pitched ball to pass therethrough; a ball pitching device arranged behind the screen to pitch a ball toward the batter's box through the pitching hole; an image processor configured to implement an image of a virtual pitcher pitching a ball; a projector configure to project the image implemented by the image processor onto the screen; and a hole opening/closing device configured to operate to close the pitching hole when the ball pitching device does not pitch the ball and to open the pitching hole when the ball pitching device pitches the ball, the hole opening/closing device comprising: an opening/closing member configured to open or close the pitching hole; and an opening/closing driver configured to provide driving force to an operation of the opening/closing member.

2. The screen baseball system according to claim 1 , wherein the opening/closing member comprises any one of a sliding opening/closing member configured to open or close the pitching hole by sliding vertically or horizontally in a linear direction, a rotational opening/closing member configured to open or close the pitching hole by rotating about a pivot point along a surface of the screen, and a door opening/closing member hinged to one side of the pitching hole to open or close the pitching hole, wherein the opening/closing driver comprises any one of a sliding drive motor configured to provide sliding driving force to the sliding opening/closing member, a rotational drive motor configured to provide rotational driving force to the rotational opening/closing member, and a door drive motor configured to provide rotational driving force to the door opening/closing member, depending on a type of the opening/closing member.

3. The screen baseball system according to claim 1 , further comprising: a controller configured to control the ball pitching device to pitch the ball according to the image implemented by the image processor and control opening/closing of the pitching hole by the hole opening/closing device.

4. The screen baseball system according to claim 3 , wherein the ball pitching device comprises: a ball feeder configured to feed a ball to a position for pitching; a pitching driver configured to fire the ball fed by the ball feeder; and a pitching controller configured to control the pitching driver according to a ball fire signal of the controller so as to fire a prepared ball.

5. The screen baseball system according to claim 4 , wherein the opening/closing driver is controlled by the pitching controller of the ball pitching device to cause the opening/closing member keeping the pitching hole closed to open the pitching hole before the pitching driver fires the ball and to cause the opening/closing member to close the pitching hole again after the pitching driver fires the ball.

6. The screen baseball system according to claim 3 , wherein the controller senses a pitching motion of the virtual pitcher in the image implemented by the image processor, wherein the controller instructs the hole opening/closing device to operate as the virtual pitcher takes a preset pitching motion and instructs the ball pitching device to fire a prepared ball according to the ball pitched by the virtual pitcher in the image.

7. A ball pitching apparatus used in a screen baseball system including a screen arranged in front of a batter's box, a projector configured to project a baseball image onto the screen, and a controller and configured to include a ball feeder arranged behind the screen to feed a ball to a position for pitching such that the ball is pitched through a pitching hole formed in the screen, and a pitching driver configured to fire the ball fed by the ball feeder, the ball pitching apparatus comprising: an opening/closing member configured to open or close the pitching hole formed in the screen; an opening/closing driver configured to provide driving force to an operation of the opening/closing member; and a pitching controller configured to control the opening/closing driver to cause the opening/closing member to open or close the pitching hole of the controller and to control the pitching driver to fire a prepared ball, according to a control signal of the controller of the screen baseball system.

8. A method of controlling pitching in a screen baseball system including a screen arranged in front of a batter's box, a ball pitching device arranged behind the screen to pitch a ball through a pitching hole formed in the screen, and an image processor configured to implement a baseball image including an image of a virtual pitcher pitching a virtual ball to be projected onto the screen, and a controller, the method comprising: sensing, by the controller, at least one of a pitching motion of the virtual pitcher in the baseball image implemented by the image processor and a ball pitched by the virtual pitcher in the baseball image; firing, by the ball pitching device, a ball according to a preset pitching condition as the controller is configured to sense a preset first pitching motion of the virtual pitcher in the baseball image; opening, by a hole opening/closing device, the pitching hole as the controller is configured to sense a preset second pitching motion of the virtual pitcher in the baseball image; and firing, by the ball pitching device, the prepared ball through the pitching hole as the controller is configured to sense whether the virtual ball pitched by the virtual pitcher is located at a preset position on the baseball image or whether the virtual ball pitched by the virtual pitcher has disappeared from the baseball image.

9. The method according to claim 8 , wherein the controller is configured to transmit a signal to the ball pitching device so as to prepare to fire the ball according to the preset pitching condition as the preset pitching motion of the virtual pitcher is sensed in the image implemented by the image processor, and to transmit the signal before opening the pitching hole or for firing the ball.

10. The method according to claim 9 , wherein, before opening the pitching hole, the controller is configured to sense whether the virtual pitcher in the image implemented by the image processor takes a preset specific motion among motions of the virtual pitcher from windup to follow-through and transmit the signal to cause the hole opening/closing device to open the pitching hole.

11. The method according to claim 9 , wherein the controller is configured to transmit a fire signal for firing the ball to cause the ball pitching device to fire the ball according to any one of sensing whether the virtual pitcher in the image implemented by the image processor takes a preset specific motion among motions of the virtual pitcher from windup to follow-through, sense whether the ball pitched by the virtual pitcher is located at a preset position on the image, and sense whether the ball pitched by the virtual pitcher has disappeared from the image.

12. The method according to claim 8 , wherein the controller is configured to transmit a signal to cause the hole opening/closing device to close the pitching hole when a preset time passes after the transmitting of a fire signal or when a preset time passes after the firing of the ball.